Herbert g



' Modem 2 sheets-sheet 1., H. G. SMITH.

EARTH DRILL. No. 508,187. Patented Nov. 7, 1893.,

2 Sheets-Sheet 2.

(No Model.)

G. SMITH. EARTH DRILL- No. 508,187. Patented Nov. 7, 1893 HRH-m me:

" rrnio STATES .a'rnNT ()rrrcn.

EARTH- DRILL.

SPECIFICATION forming part of Letters Patent No. 508,187, dated November 7,1893.

Application filed April 2'7, 1893.

To aZZ whom it may concern.- Be it known that I, HERBERT G. SMITH, a citizen of the United States, residing at Claysville, in the county of Vashington and State of Pennsylvania, have invented certain new and nsefullmprovernents in Earth-Drills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. This invention relates to improvements in the mechanism of earth drills and its objects are, first, to lengthen the reach of the temper screw relatively to the fixed limits of operation of the walking beam; secondly, to avoid kinking or bending the temper screw on withdrawal from the bore; thirdly, to better distributethe weight of the temper screw and its counterbalance, and so reduce the tendency of the temper screw to jump at the beginning of operation; fourthly, to give the lifting rope a direct vertical pull upon the temper screw, to avoid side draftand bendlng of the screw; fifthly, to keep the lifting rope from interference or entanglement with the casing, mechanism or implements used in the operation of drilling; sixthly, to better protect the pulley over which the lifting rope passes from accidental breakage or injury; seventhly, to improve the means for adj ustably holding the temper screw within its support; eighthly, to prevent undesired rotation of the drill cable upon its supports; ninthly, to improve the bearings of the rotatable sup ports of the drill bit, and tenthly, to improve the construction and operation of the cable clamps.

In the accompanying drawings, wherein like numerals represent like parts, Figure 1 is a side elevation of my improved drill; Fig. 2, a rear elevation of the same; Fig. 3, a vertic'al, longitudinal, sectional View on the line w-w of the second figure, looking in the direction of the arrow; Fig. 4, a horizontal, sectional view on the line 0c-m of the first figure, showing the detachable, threaded linings through which the temper screw works; Fig. 5, a horizontal, sectional view on the line y-y of the first figure, showing the roller bearings Serial No. 472,123- (No model.)

atthe base of the screw; Fig. 6, a horizontal, sectionalview on the line zz of the first figure, showing the clamping device for holding the cable.

The drill bit 2 is attached to the drill cable 3 in the usual manner. The cable clamps 4 and 5 are Wider at top than at the bottom.

The clamp 4 has a book, 6, preferably swiv long, threaded shank, 11, hearing against the arms, and by means of this lever the clamps are fastened to and unfastened from the cable. Each clamp has a hook, 12, bentoutward and downward from the center of its upper edge, and these hooks engage with a pair of links, 13, that connect th'cable with the supporting and operating mechanism. The cable is suitably thickened along and around the area of clamping, to enable the clamps to hold to it firmly.

The drill cable is supported directly from the temper screw 14, which has a broad, annular foot, 15, to serve as a base for the cable support, which consists of a yoke, 16,bearing the aforesaid links 13, and turning upon the shank of the temper screw. This yoke rests upon a set of thin rollers, 17', preferably four in number, the inner faces of which rest, in

single file, against the shank of the temper screw. To keep these otherwise loose rollers from falling outwardly from their vertical positions, the foot of the temper screw has a vertically rising flange, 18, encircling it, and there is interposed between the yoke and the rollers a deeply flanged washer, 19, which helps to confine the rollers to their respective places, edge to edge and in vertical position, and by means of shoulders, 20, on its upper edge, engaging with recesses, 21, in thelower edge of the yoke, the yoke andwasherinter- -When it is desired that thedrill cable shall notrotate or shall rotate ata controlled speed only, a thumb screw, 22,working through the yoke and bearing upon the temper screw, or,

if preferred, upon a bushing, which may be :0- fitted into the space indicated at 23, fitted between the yoke and the shank of the temper screw, clamps the yoke fast upon the shank, or serves as a friction brake to regulate the speed of rotation. 4

The temper screw 14 is'connected to and supported from the walking beam 24 by a pair of reins,'25, provided attheir lower ends with a pair ofboxes, 26, containing or-supporting ad- 1 justing devices for the screw. Oneof these 29 devicesisa clevis, 27,-surroundingone of the boxes and pivoted to the other,and provided 30, above the plate, so that the boxes can be I 30 quickly unclamped and the temper screw moved up or down. Eachlnterior wallof the box is fitted with a detachable, threaded, half circular lining, 31, suitably keyed in place, so that when these linings become too much worn from the friction of the temper screw they may be removed and replaced by new linings without renewing the boxes. Keyed to the temper screw, above the aforementioned yoke, is the accustomed double handled lever, 32, for Working the'temper screw up-ordow-n through the boxes when they are clamped.

The reins 25 extend above the head of the temper screw, and one of them isformed into a shoulder, 33, at the top, containing a slot, 34, to accommodate a pulley, 35, which the shoulder thus substantially protects from injury; The lifting rope 36 passes from the headof the temper screw over this pulley, 5o insuring a straight vertical pull in raising the temper screw, avoiding the waste of power and the bending of the screw in rats ing the screw by an oblique pull. The reins pass through a longitudinal slot, 37, in the walking beam, which accommodates their journal 39 in the boxes 40, or otherwise on the upper surface of the beam. By passing the reins up into the beam, and supporting the apparatus from the upper instead of the lower ace of the beam, there is a gain of length in the temper screw, enabling the drill to go deeper into the bore before readjnsting the-motor machinery or makingotherarrangemen-ts for deeper boring.

By the described method of supporting the apparatus, the lifting rope-36 is carried along It is to be understoodthat mercly-mechanhcal details in the construction of this earth drill may be varieties the ordinary judgment and experience of the constructor or operator may suggest, without departing from the sub stance or spirit of the invention. This on planation has especial reference tothe cable clamp attachments, the yokesn'pportingthe cable, the friction bearings beneath "the yoke, the clevis attaclnnents,,the interior-construction' of the boxes inclosing the temper screw, and the rein supports on the uppersu-rface-of the walking beam.

Having thus described my invention I claim the following:

1. The combination, in an earth drill, of the walking beam having the vertical, longitudinal slot near one end thereof; the pair of reins, supported by their journal upon, and depending-from the beam andpassing through the'beam slot; the pulley, mounted 5 vertically in the upper part of one of the reins; the pair of boxes formed at the bottom of p the reins, having concave, sem.ioircular,screwthreaded inner faces; the clevis, pivoted to one box and loosely encircling the other, and having a set screw fitted in and through it, opposite the pivoted end or section; the temper screw between the reins, having the lifting rope in the head thereof, passing over the aforesaid. pulley, and further having the fixed hand lever below the aforesaid boxes, and the annular foot with vertically rising flange; the rollers, placed around the shank of the temper screw, upon the annular foot and within the flange; the yoke loosely mounted and turning upon the temper screw and supported upon the aforesaid rollers, and the pair of cable clamps, linked to and below-said yoke, and having-projected fr 111 the vertical edges of one clamp the hook and the pivot screw, and, from the vertical edges of the other, the eye engaged with the hook and the arms embracing the pivot sore =.*-the said pivot screw having thereon a lever with a threaded shank bearing against the arms aforementioned; the Whole constructed and arranged substantially as and for the purposes described.

2. The combination in an earth drill of the walking beam having the vertical longitudinal slot near one end thereof; a pair of reins, supported. by their journal upon, and dependingfrom the beam and passing through the beam slot; the pulley, mounted vertically in the upper part of one of the reins; the temsome? per screw between the reins,'having in its head the lifting rope, passing over the aforesaid pulley, and further provided with fixed hand lever, below the stores" id reins, and

5- with the annular foot; and th e evit, pivoted to the lower part of one rein and .Josely encircling the other, and iii-tin; set screw fitted in and through it, opposite the pivoted l end or section of said clevis; all substantially as described, for the purposes set forth.

In testimony whereof I afiix my signature in presence of two witnesses.

HERBERT G. SMITH. \Vitnesses:

JAMES A. WILEY, JOSEPH F. MGFARLAND. 

